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[Varche]

Actually make that three categories.

1 BP, Shell type garages

2. Supermarket

3. Low cost fuel outlets.

The spread between the three is quite big in Spain. What about the quality? Are we going to see a lot of worn out cars in five years time from using the cheap stuff?  Does it matter which we use?

[Field Marshal Dr. Opti]

For my classic Vauxhall I fill with the cheap crap.

The Tata seemed to run better on super unleaded.

Placebo or..........  

[ronnyd]

Gulf filling station at Roydon, nr Diss was £189.9 when I walked past today.. I paid £170.9 at BSE Sainsbury  a couple of days ago.
E10 of course.

[Nick W]

Actually make that three categories.

1 BP, Shell type garages

2. Supermarket

3. Low cost fuel outlets.

The spread between the three is quite big in Spain. What about the quality? Are we going to see a lot of worn out cars in five years time from using the cheap stuff?  Does it matter which we use?

As most fuel used comes from the same refineries and distribution centres, perhaps you should replace quality with marketing? Once you know that, why would you fall for it?


Personally, I think buying from a petrol station that has a good turnover of fuel and obviously takes care of their equipment(the underground tanks are consumable items) is far more important than the logo on the sign.


Just how many cars actually benefit from premium fuel? Especially as premium is one the marketing department's favourite words.

[Rangie]

I've used BP ultimate diesel/petrol in our vehicles & also fuel from our local Sainsbury's, ( wherever I don't have to queue) can honestly say that I've noticed no difference in consumption or performance.

[STEMO]

Diesel is diesel, how can you have premium tractor juice? 

[johnnydog]

Since the introduction of E10, I have only put Super Unleaded E5 Tesco Momentum in the 3.2, and it seems a lot more spritely, and more responsive. I have also used it continuously in the 2.6, and initially not noticed any particular difference, but since having its brand new ECU fitted, it has transformed the car. Its not quite up to the 3.2 performance, but its better than it ever has been.
Imagining it, you could possibly argue, but the performance in both certainly seemed to have improved in my mind using E5.

[Raeturbo]

As long as your ecu can learn to advance the timing then you will get more power from a higher octane fuel.

[Nick W]

As long as your ecu can learn to advance the timing then you will get more power from a higher octane fuel.

that's not quite how it works; the ECU will back off the timing if it senses the engine is knocking, for whatever reason. Just adding octane isn't a magic power increase. And Omegas aren't highly tuned boosted, race or DI engines that are designed from the start for it.


The difference between ordinary and premium fuel is small, therefore any actual gains are correspondingly small, limited in scope and largely subjective in a soft, automatic, road car. I've tried it in everything I've owned over the last 25ish years, and the only car that had a noticeable difference was the GDI Legnum. And that was so small that the extra cost wasn't justifiable

[Raeturbo]

Indeed but if you’re going to use higher octane fuel and you get your car mapped for it there is more power. The ecu will pull a few degrees retard if it gets a knock count but some ecu are able to advance timing up until knock and of course if you can advance the timing without pre ignition you get more power. My Evo is mapped for V power and that gives more power as I’m able to run a tad more boost. Does the Omega have a learning ecu?

[cam.in.head]

im using esso 99 ron in the omega as a matter of course as its ethanol free ( or worse case 5%) and no real noticeable gains or problems but in my older cars where the ethanol could be an issue the 99 octane does allow you to set the timing to where the engine was originally designed for when using leaded 4 star rather than the customary retardation you usually had to do.this gives it back the performance level and smoothness that they lost with modern fuels .

[Raeturbo]

Agreed

[Doctor Gollum]

Shell V Power made a tangible difference in my old 1.4 Pug 106, both in terms of pep and mpg, and certainly enough to justify the, then, extra 6ppl.

Modern cars have emission control systems that far outperform older designs, making the difference much less noticeable.

The biggest issue now is the variability and degredation of modern biofuels...